How to check Mirror Displays checkbox

Question

I have the following:
tell application "System Preferences"
activate
set current pane to pane "Displays"
tell application "System Events"
try
tell application process "System Preferences"
click radio button "Arrangement" of tab group 1 of window "Cinema HD"
tell window "Cinema HD"
click checkbox "Mirror Displays" of tab group 1 of window "Cinema HD"
end tell
end tell
end try
end tell
end tell
The only thing that doesn't work is the checkbox line. I've also tried it as checkbox 1, BTW.
What am I doing wrong?

Answer 1

Hi, Pierre--
No, I used UI Browser.
However, I think I may have found the issue, although not the solution. Remember that mirroring is available only when you have 2 monitors, which I do. But that means the Displays open 2 windows, in my case, one named "Cinema HD", the other "Samsung". They both have the "Mirror Displays" checkbox.
I tried doing:
click radio button "Arrangement" of tab group 1 of window "Cinema HD"
tell window "Samsung"
click checkbox "Mirror Displays" of tab group 1
end tell
tell window "Cinema HD"
click checkbox "Mirror Displays" of tab group 1
end tell
end tell
But that again, doesn't work.